Minor docs improvements

Author: tzolov

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/functions.adoc

@@ -3,10 +3,14 @@
 
 The integration of function support in AI models, permits the model to request the execution of client-side functions, thereby accessing necessary information or performing tasks dynamically as required.
 
+image::function-calling-basic-flow.jpg[Function calling, width=500, align="center"]
+
 Spring AI currently supports Function invocation for the following AI Models
 
 * OpenAI: Refer to the xref:api/chat/functions/openai-chat-functions.adoc[Open AI function invocation docs].
 * VertexAI Gemini: Refer to the xref:api/chat/functions/vertexai-gemini-chat-functions.adoc[Vertex AI Gemini function invocation docs].
 * Azure OpenAI: Refer to the xref:api/chat/functions/azure-open-ai-chat-functions.adoc[Azure OpenAI function invocation docs].
 * Mistral AI: Refer to the xref:api/chat/functions/mistralai-chat-functions.adoc[Mistral AI function invocation docs].
-* Anthropic Claude: Refer to the xref:api/chat/functions/anthropic-chat-functions.adoc[Anthropic Claude function invocation docs].
+* Anthropic Claude: Refer to the xref:api/chat/functions/anthropic-chat-functions.adoc[Anthropic Claude function invocation docs].
+* MiniMax : Refer to the xref:api/chat/functions/minimax-chat-functions.adoc[MiniMax function invocation docs].
+* ZhiPu AI : Refer to the xref:api/chat/functions/zhipuai-chat-functions.adoc[ZhiPu AI function invocation docs].

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/index.adoc

@@ -28,6 +28,8 @@ Portable `Vector Store API` across multiple providers, including a novel `SQL-li
 
 image::function-calling-basic-flow.jpg[Function calling, width=500, align="center"]
 
+Check the Spring AI xref::api/functions.adoc[Function Calling] documentation.
+
 === Auto Configuration
 
 Spring Boot Auto Configuration and Starters for AI Models and Vector Stores.